A name is inscribed in orchestra area identifying instrumentalist (7)
I believe the answer is:
pianist
'instrumentalist' is the definition.
(pianist is a kind of instrumentalist)
'a name is inscribed in orchestra area' is the wordplay.
'a name' becomes 'pia'.
'inscribed in' is an insertion indicator.
'orchestra area' becomes 'nt' (I can't explain this - if you can you should believe this answer much more).
'is' placed inside 'nt' is 'nist'.
'pia'+'nist'='PIANIST'
'identifying' acts as a link.
Can you help me to learn more?
(Other definitions for pianist that I've seen before include "Expert on keys" , "Musician" , "Key worker," , "key man" , "Person at keyboard" .)